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Yanmar not making RPM
Ok this one has me stumped. I have a Yanmar 3GMF and can only make 2000 RPM's. My guess is that I'm leaving a lot of power untapped by not getting close to the max of 3200. Also when I recently opened up the throttle all the way, the power was reduced and a lot of back smoke and what appeared to be carbon came out the exhaust. I checked the intake and saw that it was full of black soot. It look exactly like what was coming out the exhaust.
Could this be culprit for not getting to 3200 RPM? Should I take off the intake and clean it or is it normal to have soot buildup in it? Could a fouled prop be the cause of lack of RPM (bottom and prop was done 9 months ago). Could the pitch of the prop be wrong? Since this is a fairly new boat to me, I don't have any history on what is normal.
A few more points. I can get max RPM when in neutral. The engine has about 350 hrs on a rebuild. I just recently (4 months ago) added a fuel treatment that allow kills algae build up and keeps the fuel fresh.
Thank for the help....bf
Last edited by Flyyboy; 12-18-2009 at 04:16 PM.
Reason: Added additional information